Light bulb



FIG. 1 is a perspective view of a first embodiment of the lighting bulb;

FIG. 2 is a front view thereof, the rear view being the same as thefront view;

FIG. 3 is a side view thereof, the opposite side view being the same asthe side view; and,

FIG. 4 is a sectional view thereof, taken along the line 4-4 of FIG. 2.

The broken line showing of the attachment portion is included for thepurpose of illustrating only and forms no part of the claimed design.

CLAIM The ornamental design for a light bulb, as shown and described.